Variables

In every major programming language, the concept of variables is a universal one. In short, variables allow programmers to store values such as numbers and texts so that the values can be referenced and used by the rest of the application. Variables are often declared by a variable type and depending on the language can be immutable (value cannot be changed) using keywords like 'const' in JavaScript or 'val' in Kotlin.

Select Languages

Examples

C

int carCount = 2;
char name[] = "Joe";

#include <stdbool.h>
bool isPurple = true;

C#

int carCount = 2;
string name = "Joe";
bool isPurple = true;

C++

int carCount = 2;
string name = "Joe";
bool isPurple = true;

Go

var carCount int = 2
var name string = "Joe"
var isPurple bool = true

Java

int carCount = 2;
String name = "Joe";
boolean isPurple = true;

JavaScript

var carCount = 2;
let name = 'Joe';
const isPurple = true;

Kotlin

val carCount = 2;
val name: String = "Joe";
val isPurple: Boolean = true;

MatLab

carCount = 2;
name = 'Joe';
$isPurple = true;

PHP

$carCount = 2;
$name = "Joe";
$isPurple = true;

Python

carCount = 2
name = 'Joe'
isPurple = true

R

carCount <- 2
name <- "Joe"
isPurple <- TRUE

Ruby

carCount = 2
name = "Joe"
isPurple = true

Rust

let carCount = 2;
let name = "Joe";
let isPurple = true;

Scala

var carCount = 2;
val name: String = "Joe";
val isPurple: Boolean = true;

Swift

var carCount = 2;
var name: String = "Joe";

// constant variable
let isPurple: Bool = true;

TypeScript

function main() {
  var carCount = 2;
  let name: String = 'Joe';
  const isPurple: Boolean = true;
}

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